✔ 最佳答案
解:1) (3+3/1)*10.8=x+3.6A. (3+ 3/1)*10.8 = x+6 or (3+3 /1)*10.8 = x+6(6)*10.8 = x+6x = 64.8-6x = 58.82) (1/2)x+(1/3)x+600=xA. (1/2)x+(1/3)x+600 = x600 = x(6-3-2)/ 6x/ 6 = 600x = 36003) x+2=6/1.2A. x+2 = 6/1.2x = 5-2x = 34) x/4+(x-x/4)(3/5)+x/5=x-50A. x/4 + (x- x/4)(3/5) + x/5 = x-5020 (x/4 + (3x/4)(3/5) + x/5) = 20(x-50)5x+9x+4x = 20x-10002x = 1000x = 5005) 兄弟年後之和是20歲，4年前，兄年是弟年的2倍，問兄弟今年各幾歲？A. 設兄弟今年各x, y歲.x+y = 20x-4 = 2(y-4)x = 2y-4So, 2y-4+y = 203y = 24y = 8所以, 兄弟今年各(20-8) = 12歲, 8歲6) 乙比甲大32歲，6年後，甲年是乙年的5倍，求甲乙今年各幾歲？A. 設甲乙今年各x, y歲.y-32 = xy+6 = 5(x+6)y = 5x+24So, 5x+24-32 = x4x = 8x = 2所以, 甲乙今年各2, (2+32) = 34歲.7) 4(x/2-3)=x-4A. 4(x/2 -3) = x-4x = -4+12x = 88) (b)(b)=(b+2)(b-1)A. (b)(b) = (b+2)(b-1)b^2 = b^2+b-2b = 29) (((c/2+1)/2+1)/2-1)=1A. ((c/2+1)/2+1)/2-1 = 1(c/2 +1)/2 +1 = 4c/2 = 5c = 1010) 100(9-x+3)+0+(x-3)=100x+0+(9-x)A. 100(9-x+3)+0+(x-3) = 100x+0+(9-x)1200-100x+x-3 = 100x+9-x1002x = 12x = 2/16711) 15.6x13.04(3.75-x)=55.3A. I can’t get your meaning...12) x+(5x+1)+(25x+6)=999A. x+(5x+1)+(25x+6) = 99931x = 992x = 3213) x=5(x+5)-5(x-5)A. x = 5(x+5)-5(x-5)x = 5(x+5-x+5)x = 5014) (5000+y)(20+x)=125150A. (5000+y)(20+x) = 125150100000+5000x+20y+xy = 1251505000x+20y+xy = 25150Actually, two variables with one equation is unable to be solved.終極難題:)x-(1/2+20000)-(3/4(x-(1/2x=20000)-10000)=205000 A. x-(1/2+20000)-(3/4(x-(1/2x#### = ####20000)-10000) = 205000In “## ##”, it shouldn’t be “=”. What is that?(1abcde)3=abcde1 A. Let abcde be x.(1x)3 = 1x3x = xx = 0abcde = 0要步驟!!
2010-10-17 01:27:26 補充：
解:
1) (3+3/1)*10.8=x+3.6
A. (3+ 3/1)*10.8 = x+6 or (3+3 /1)*10.8 = x+6
(6)*10.8 = x+6
x = 64.8-6
x = 58.8
2) (1/2)x+(1/3)x+600=x
A. (1/2)x+(1/3)x+600 = x
600 = x(6-3-2)/ 6
x/ 6 = 600
x = 3600
3) x+2=6/1.2
A. x+2 = 6/1.2
x = 5-2
x = 3
2010-10-17 01:28:28 補充：
4) x/4+(x-x/4)(3/5)+x/5=x-50
A. x/4 + (x- x/4)(3/5) + x/5 = x-50
20 (x/4 + (3x/4)(3/5) + x/5) = 20(x-50)
5x+9x+4x = 20x-1000
2x = 1000
x = 500
5) 兄弟年後之和是20歲，4年前，兄年是弟年的2倍，問兄弟今年各幾歲？
A. 設兄弟今年各x, y歲.
x+y = 20
x-4 = 2(y-4)
x = 2y-4
So, 2y-4+y = 20
3y = 24
y = 8
所以, 兄弟今年各(20-8) = 12歲, 8歲
2010-10-17 01:28:38 補充：
6) 乙比甲大32歲，6年後，甲年是乙年的5倍，求甲乙今年各幾歲？
A. 設甲乙今年各x, y歲.
y-32 = x
y+6 = 5(x+6)
y = 5x+24
So, 5x+24-32 = x
4x = 8
x = 2
所以, 甲乙今年各2, (2+32) = 34歲.
7) 4(x/2-3)=x-4
A. 4(x/2 -3) = x-4
x = -4+12
x = 8
8) (b)(b)=(b+2)(b-1)
A. (b)(b) = (b+2)(b-1)
b^2 = b^2+b-2
b = 2
2010-10-17 01:28:48 補充：
9) (((c/2+1)/2+1)/2-1)=1
A. ((c/2+1)/2+1)/2-1 = 1
(c/2 +1)/2 +1 = 4
c/2 = 5
c = 10
10) 100(9-x+3)+0+(x-3)=100x+0+(9-x)
A. 100(9-x+3)+0+(x-3) = 100x+0+(9-x)
1200-100x+x-3 = 100x+9-x
1002x = 12
x = 2/167
11) 15.6x13.04(3.75-x)=55.3
A. I can’t get your meaning...
2010-10-17 01:29:03 補充：
12) x+(5x+1)+(25x+6)=999
A. x+(5x+1)+(25x+6) = 999
31x = 992
x = 32
13) x=5(x+5)-5(x-5)
A. x = 5(x+5)-5(x-5)
x = 5(x+5-x+5)
x = 50
14) (5000+y)(20+x)=125150
A. (5000+y)(20+x) = 125150
100000+5000x+20y+xy = 125150
5000x+20y+xy = 25150
Actually, two variables with one equation is unable to be solved.
2010-10-17 01:29:10 補充：
終極難題:)
x-(1/2+20000)-(3/4(x-(1/2x=20000)-10000)=205000
A. x-(1/2+20000)-(3/4(x-(1/2x#### = ####20000)-10000) = 205000
In “## ##”, it shouldn’t be “=”. What is that?
(1abcde)3=abcde1
A. Let abcde be x.
(1x)3 = 1x
3x = x
x = 0
abcde = 0
要步驟!!
